Math keywords

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Across
  1. 3. answer of an addition problem
  2. 5. A number with one or more digits to the right of the decimal point
  3. 8. the answer to a multiplication problem
  4. 9. （）
  5. 11. going across and parallel to the ground
  6. 14. the result of subtraction
  7. 15. The distance around a figure
Down
  1. 1. to make sure that something is true
  2. 2. the number written on the top of the fraction
  3. 4. directly upright
  4. 6. Length x Width
  5. 7. to plus
  6. 10. the number written below the fraction
  7. 12. two lines which has a same endpoint
  8. 13. to write something in the easiest way